Air conditioning device

Abstract

An air conditioning device includes a gas furnace unit, a heat-pump heat source unit, and one or more utilization units. The gas furnace unit includes an air blower and a first heat exchanger. The utilization unit includes a second heat exchanger. The air conditioning device has a first operation mode in which a heating operation is performed using the gas furnace unit, a second operation mode in which a heating operation is performed using the heat-pump heat source unit, and a third operation mode in which a cooling operation is performed using the heat-pump heat source unit, and performs refrigerant discharge control for temporarily moving a refrigerant on the heat-pump heat source unit side to the second heat exchanger side of the utilization unit at the time of starting of a compressor provided in the heat-pump heat source unit when the first operation mode is switched to the second operation mode.

1 . An air conditioning device comprising:
 a gas furnace unit including a gas heat source using gas;   a heat-pump heat source unit of a heat pump type; and   one or more utilization units connected to the heat-pump heat source unit via a refrigerant pipe,   wherein the gas furnace unit includes an air blower provided on an inlet side of air of the gas furnace unit and a first heat exchanger provided on an outlet side of air taken in by the air blower,   wherein the utilization unit includes a second heat exchanger provided on an outlet side of air after the air taken in by the air blower has passed through the first heat exchanger,   wherein the air blower is commonly used by both the first heat exchanger and the second heat exchanger, and an air flow of air taken in by the air blower flows in the order of the first heat exchanger and the second heat exchanger, and   wherein the air conditioning device has a first operation mode in which a heating operation is performed using the gas furnace unit, a second operation mode in which a heating operation is performed using the heat-pump heat source unit, and a third operation mode in which a cooling operation is performed using the heat-pump heat source unit as operation modes, and includes a control unit configured to perform refrigerant discharge control for temporarily moving a refrigerant on the heat-pump heat source unit side to the second heat exchanger side of the utilization unit at the time of starting of a compressor provided in the heat-pump heat source unit when the first operation mode is switched to the second operation mode.   
     
     
         2 . The air conditioning device according to  claim 1 , wherein the control unit ascertains an operating state of the gas furnace unit before the second operation mode is performed when the second operation mode is performed, and proceeds to the second operation mode after the refrigerant discharge control has been temporarily performed when the gas furnace unit has operated in the first operation mode. 
     
     
         3 . The air conditioning device according to  claim 2 , wherein the control unit ascertains the operating state of the gas furnace unit before the second operation mode is performed when the second operation mode is performed, and proceeds to the second operation mode without performing the refrigerant discharge control when the gas furnace unit has not operated. 
     
     
         4 . The air conditioning device according to  claim 2 , further comprising:
 a temperature sensor provided for the second heat exchanger,   wherein when the heat-pump heat source unit side cannot ascertain the operating state of the gas furnace unit, the control unit performs the refrigerant discharge control when the temperature measured by the temperature sensor at the time of starting of the compressor is equal to or higher than a predetermined threshold value when the second operation mode is performed.   
     
     
         5 . An air conditioning device comprising:
 a gas furnace unit including a gas heat source using gas;   a heat-pump heat source unit of a heat pump type; and   one or more utilization units connected to the heat-pump heat source unit via a refrigerant pipe,   wherein the gas furnace unit includes an air blower provided on an inlet side of air of the gas furnace unit and a first heat exchanger provided on an outlet side of air taken in by the air blower,   wherein the utilization unit includes a second heat exchanger provided on an outlet side of air after the air taken in by the air blower has passed through the first heat exchanger and a temperature sensor provided for the second heat exchanger,   wherein the air blower is commonly used by both the first heat exchanger and the second heat exchanger, and an air flow of air taken in by the air blower flows in the order of the first heat exchanger and the second heat exchanger, and   wherein the air conditioning device has a first operation mode in which a heating operation is performed using the gas furnace unit, a second operation mode in which a heating operation is performed using the heat-pump heat source unit, and a third operation mode in which a cooling operation is performed using the heat-pump heat source unit as operation modes, and includes a control unit configured to perform refrigerant discharge control for temporarily moving a refrigerant on the heat-pump heat source unit side to the second heat exchanger side of the utilization unit when the temperature measured by the temperature sensor at the time of starting of a compressor provided in the heat-pump heat source unit is equal to or higher than a predetermined threshold value when the second operation mode is performed.   
     
     
         6 . The air conditioning device according to  claim 5 , wherein the control unit does not perform the refrigerant discharge control when the temperature measured by the temperature sensor is lower than the predetermined threshold value when the second operation mode is performed. 
     
     
         7 . The air conditioning device according to  claim 1 , wherein the control unit performs operation in the third operation mode as the refrigerant discharge control. 
     
     
         8 . The air conditioning device according to  claim 1 , wherein a four-way valve for switching a direction in which the refrigerant flows in the refrigerant pipe between during a cooling operation and during a heating operation is provided in the middle of the 5 refrigerant pipe, and
 wherein the control unit controls the four-way valve such that the direction in which the refrigerant flows in the refrigerant pipe becomes the direction during the cooling operation as the refrigerant discharge control.   
     
     
         9 . The air conditioning device according to  claim 1 , wherein the control unit switches the first operation mode to the second operation mode according to an outside air temperature. 
     
     
         10 . The air conditioning device according to  claim 5 , wherein the control unit performs operation in the third operation mode as the refrigerant discharge control. 
     
     
         11 . The air conditioning device according to  claim 5 , wherein a four-way valve for switching a direction in which the refrigerant flows in the refrigerant pipe between during a cooling operation and during a heating operation is provided in the middle of the refrigerant pipe, and wherein the control unit controls the four-way valve such that the direction in which the refrigerant flows in the refrigerant pipe becomes the direction during the cooling operation as the refrigerant discharge control. 
     
     
         12 . The air conditioning device according to  claim 5 , wherein the control unit switches the first operation mode to the second operation mode according to an outside air temperature.